An Introduction to Using Lidar with ArcGIS and 3D Analyst

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1 FedGIS Conference February 24 25, 2016 Washington, DC An Introduction to Using Lidar with ArcGIS and 3D Analyst Jim Michel

2 Outline Lidar Intro Lidar Management Las files Laz, zlas, conversion tools Las Dataset Las Dataset Analysis Profile Measurement, classification Creating Elevation datasets DSM and DTM with Mosaic Dataset 3d Web Scenes in Arcgis Create 3d web scene

3 LiDAR Light Detection And Ranging Optical remote sensing technology that measures the distance from the sensor to a target

4 Lidar Data First Return SecondReturn ThirdReturn Last Return

5 Lidar Data First Return DSM SecondReturn ThirdReturn Last Return

6 Lidar Data First Return DSM SecondReturn ThirdReturn DTM Last Return

7 Key Lidar Functionality Surface analysis - First-return - Bare-earth 2d GIS Layers Feature extraction - Digitizing - Point classification Background information - Measuring - Data validation LiDAR Imagery DTM DSM NDSM Imagery Application Sharing - Serving - Zip-and-ship 3D map

8 Natural Resource Management - Forestry See the forest AND the trees

9 Slope Map

10 Canopy Height Map

11 Energy Transmission Lines View, measure or analyze from any location Profile Perspective

12 Challenges of Working with Lidar Data Huge Volumes Multiple Sources Multiple Projections Varying Accuracy Multiple Representations How to manage? How to analyze? How to access? Use of elevation data has been a challenge

13 Using LiDAR in ArcGIS Provides an open and productive platform for LAS files LAS Dataset Terrain Dataset Mosaic Dataset Fast access; no conversion Converts LAS to TIN Used to catalog & serve LAS Direct Edit of LiDAR Points Use with LAS 3D View Use with LAS Profile View Access to 3D Analyst Best Terrain Representation Scalable and Seamless Both LAS & Terrain Datasets Store with other DEM Use to Orthorectify Three Data types Integrates LiDAR across all GIS functionality

14 Managing LAS Files LAS File Esri Optimized zlas LAS Dataset ASPRS Standard Points and Metadata No Indexing Very Large Files Compressed Lossless Use Direct Built for Server Mosaic Dataset References Multiple LAS, zlas files Surface Constraints Enables Visualization Data Model for Serving Manages point clouds like imagery Generates Surface

15 Compressed LAS files Zlas optimized Las files - Highly Compressed Esri s compression technology reduces file size significantly more than generic compressors can (e.g., gzip) because it was written specifically for LAS. Better compression results in reduced storage and bandwidth requirements. - Lossless The lidar point record data is preserved exactly. There is no loss of information so the full integrity of the data is maintained. - Directly Usable The optimized LAS data can be used directly without need to decompress it first. The ArcGIS 10.3 platform has been enhanced to support optimized LAS. - Efficient Data Access Statistics and spatial indexing are added during the compression process. This makes the resulting files easier to use and the data is accessed more efficiently for both spatial and thematic queries. An option to sort point records to improve the I/O efficiency of queries on the optimized files is included. - Free

16 Las and 3D Sample tools

17 Demo Las formats and tool overviews

18 LAS Dataset New data type File based Stores references to LAS files on disk Optionally reference breakline data Treats a collection of LAS files as one logical dataset

19 LAS Dataset Strengths Scalability - Works directly on LAS files Data Integration - Point cloud and breakline support - Storage efficient Data Management - I/O efficient - Edit LAS classifications

20 LAS Dataset Creation Interactively via Catalog - File folder context menu Using scripts and models with geoprocessing tools

21 LAS Dataset Editing Class Codes Manual - Fixing data anomalies and misclassifications via point profile window Automated (GP tools) - Classify relative to feature data - Reclassify to standard LAS specification

22 LAS Dataset Interactive Editing

23 LAS Dataset Manage Batch Oriented Editing Change LAS Class Codes tool - Set class by proximity to feature data Set LAS Class Codes Using Features - Reclassify old class to new class

24 LAS Dataset Dataset based LAS Dataset Properties: LAS Dataset Statistics

25 LAS Dataset File based LAS Dataset Properties: LAS File Statistics

26 LAS Dataset Analysis Derive surfaces - As raster - As TIN Direct surface analysis - Interpolate shape - Add surface information - Line of sight - Skyline - Locate outliers Rasterize on point metrics - LAS point statistics as a surface

27 LAS Dataset Point display

28 LAS Dataset Surface Display

29 LAS Dataset Point Filters

30 LAS Dataset 3D Display in ArcScene Data courtesy Merrick & Co.

31 LAS Dataset LAS File Extents

32 Best Practices Tiled LAS, v1.1 or higher 1-2 million points per file Projected Keep file I/O local, avoid network Airborne - Classified (bare earth, non-ground) - Breaklines for hydro enforcement - Study area boundary included as constraint Terrestrial - RGB, intensity, or classified

33 Licensing Standard, 3D, or Spatial Analyst Extension - Create LAS dataset - Modify LAS dataset schema - Include in Mosaic dataset - Publishing requires Image extension for Server - View in 2D - Rasterize 3D Analyst Extension - Edit class codes - View in 3D - TIN based surface analysis

34 Demo Working with LAS Datasets

35 Mosaic Datasets for Elevation Distinguishing Concepts Image Services - Access to original data - Optimizes System Resources On-The-Fly Processing - Process Imagery as Accessed - Create Multiple Products direct from Source t1 t2 t3 t4 t5 Dynamic Mosaicking - Fuse Imagery from Multiple Sources - User Defined Ordering

36 Mosaic Datasets are a Data Model for Imagery Catalog Functions On-the-Fly Processing Dynamic Mosaics Managed Content - Catalogs of Imagery and rasters - Multiple image types / resolutions - Smart use of metadata - Optimized pyramid layers, footprints and thumbnails Associates Knowledge with Imagery - Custom raster functions on-the-fly - Dynamic mosaic rules for overlap - Time-aware Seamless Approach for serving Imagery - Regional processing versus a file - Color balancing - Seamline blending - Mosaics are virtual

37 Example ArcGIS World Elevation Server Raster Functions Source Imagery Source Mosaic Datasets Derived Mosaic Dataset Single image service with multiple server functions Orthometric Height Hillshade f Slope Aspect Ellipsoidal Height many other functions

38 Imagery LiDAR normalized digital surface model digital surface model digital terrain model

39 Demo Creating Elevation Services

40 Don t forget to complete your digital session survey Download the Esri Events app!

41 Please Take Our Survey! Download the Esri Events app and find your event Select the session you attended Scroll down to find the survey Complete Answers and Select Submit

42 Networking Reception Smithsonian National Museum of the American Indian Thursday, 6:30 p.m. 9:30 p.m. Bus pickup on L Street

43 Print your customized Certificate of Attendance Print stations located in the 140/150 Concourse

44 GIS Solutions Expo, Hall A Wednesday, 12:30 p.m. 6:30 p.m. Welcome Social, 5:15 p.m. 6:30 p.m. Thursday, 10:45 a.m. 4:00 p.m. Exhibitors Hands-on Learning Lab Demo Theaters Esri Showcase

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